Since Vocaloid is pretty much a blank slate for whatever the composer decides to make, many of them can turn out differently than the next. These composers and songs just... decided to try and scare you. Fortunately for them note and unfortunately for us, these songs did.
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Machine Muzik. Seriously. There's a reason it's the page image. Just see for yourself.
Then watch the sequel, Nehanshika. One attempted translation made a couple of lines potentially worse ("We can account for e-e-e-errors";"Now that you're dead you sing Nehanshika-hanshika").
The creator, Deino (on Youtube known as Deino3330), was also behind this little nightmare. The song itself isn't Vocaloid, although the video does involve Calcium. Character's named Calne Ca, with "Ca" pronounced as separate letters, and is shown in the picture above.
BitCrushe isn't as bad as the above videos, but it's still extremely eerie.
"Bacterial Contamination" (or Saikin Osen). The song is about an unpopular girl being mocked and bullied by others, in turn becoming a bully herself in an attempt to make herself feel better, and then committing suicide to try and get away from the "infection." In the end, she states that, even though she could die to get away from the suffering, she still couldn't even die with dignity because of the things she'd done. And the singer herself is the aforementioned Calne Ca.
The English dubbed version (yes, it has been done) is arguably even worse . Especially the ending, where you hear the singer laughing quietly. She then says " sayonara " then devolves into insane laughter. Watch it here.
Bad End Night. Even though the song is fairly up-beat and jazzy, it is actually quite sinister. A girl (Miku) is lost with a letter to go to some mansion. She finds it and is greeted by the other Vocaloids. Later, she tries to go to sleep, only to find that no time goes by. She runs away, only to find graves. She finds that they are pretty much planning to kill her. In her fear, she pretty much kills them all. And then the final lines...
The P.O.V. Sequel, Crazy Night paints the house's residents as much more sympathetic, but is still quite sinister; turns out, their clock stopped because Miku interrupted their play and tore out the page that led to the ending. It turns out that she had to kill them to get to the ending. After doing so, however, she finds that she doesn't like the ending. As the family goes on to the next cycle (as there appears to be a time loop going on) Miku runs after them, begging them to give her another chance. They tell her that there isn't enough time but she'll "have another chance tomorrow", implying that she is now trapped in the same loop as them forever or at least until the chain is broken.
Twilight Night, the third installment is more confusing and even darkly humorous than scary, but it still has its unsettling moments. For example, when the inhabitants find that the last page of their script is missing, Rin and Len say this:
Breaking Things Into Pieces gets the point across what type of producer this person is. Do we start with the fact that if the vocals are taken out, it sounds like a rousing march? Even though the imagery is very Neon Genesis Evangelion-esque. The lyrics, you ask? It talks about a girl who can't stop breaking things. The chorus tells us that the girl can also rebuild the objects she destroyed in order to break them even more "to the point [where] you forget its original shape". Then comes the explanation. She destroys precious objects because the more memories an object goes through, the more it become attached to a person's soul. She's equating property damage with homicide. And the kicker is that there is a person that loves her. Her last act is to destroy every object they possess, before killing herself as her lover is now part of her. Throw in Nightmare Face and shattered like glass bodies and the Holy Shit Quotient gets to be pretty high.
A Happy Death seems to be about two kids killing each other to be 'happy' in the afterlife.
You're a Useless Child - a blunt narration of parental abuse. No self-destructive fixations, no over-the-top gore, no child-murdering dystopias, just the story of a terrible mother and her pitiful child.
"We Should Not Do Bad Things" Take a seemingly happy sounding song and add lyrics about bad children being "taken away", and it becomes horrifying.
...You know, let's just say most of the songs by Machigerita-P (except for a couple of surprisingly cute songs he created for Miku) are made to scare you. And horribly scare you they do.
The other song, Wide Knowledge of the Late, Madness? This is how the children became the attractions of the circus. Going though both videos the children were kidnapped while they're in the circus, somehow put into an insane asylum, get deformed, and then be put as attractions of that circus. The PV clearly shows Meiko running the asylum and butchering its patients to sew together and make the attractions. This makes it even more scary as the protagonist of Dark Woods Circus looks like a young version of Meiko.
Rotten Girl, Grotesque Romance. It's basically about a very jealous stalker girl, who spies on the object of her affections. When she realizes that person is seeing another girl, she goes insane and plans to kill the girl and send her dismembered in a box to the person. And possibly kidnapps and murders them. That, coupled with the audio, piano, and random screeches in the music, makes all the more horrifying. It gets scarier when you listen to the Rockleetist version, where you can actually understand it. Oh, and don't forget the picture of Miku in the video. And the sound of her cutting off a kitten's head to give to her boyfriend. And as if it couldn't get any creepier...someone has managed to sing an English dub of it...and it happens to be rather awesome yet terrifyingly disturbing at the same time: Click and behold. And here's a lovely PV.
If you think about it, they probably weren't ever together to begin with...
The PV has the stalked boy keep the corpse of the murdered girl in his apartment for days. He even brushes its hair.
Red Swamp Bottom is a sequel to "Dark Woods Circus", and is much, much scarier. It's about Miku in hell, for god's sake! Special mention has to go to the tortured screams in the beginning and this particular set of lyrics:
Machigerita-P's done it AGAIN, using either Miku Append Light or Miku Append Vivid, in "Shukujo Berry no Tsukurikata", also known as "How to Make A She-trawberry". And it's most likely some kind of unholy cross between horror and porn from the lyrics. It's either about well... rape, or about someone eating a strawberry cake. Probably the former, knowing Machige.
Sweet Poison Factory by Machigerita-P. Your Mileage May Vary, but if the lyrics don't scare you, the images are enough to overstimulate your senses... (Don't watch if you have epilepsy or if flashing lights give you migraines.)
Okaasan is the undeniable master of all HONF for Vocaloid, hands-down. Lyrics are in the comments.
Masa is a relatively unknown producer, but those who encounter some of his music will be rattled. While the videos may be creepy, having the lyrics translated make it all the more unnerving. The worst case offender is "The Spider and the Kitsune-like Lion", where Miku is tortured to death and Gumi is turned on by her pain. It's highly graphic and very not safe for work. This song was set to private on Masa's Youtube channel (ell182a) and removed from Nicovideo for good reason. The best part? It's part of a series.
mothy (master of the heavenly yard) had gotten a reputation from the Evillious Chronicles; it has its own "wiki", and most of his songs end with someone being murdered or worse... Has its own page here.
"Moonlit Bear" starts off with a woman finding these magical fruits in a forest, taking them with the goal of making her husband happy and encountering an evil bear who wants the fruit back. Sounds like a nice adventure story, right? Fridge Horror gets applied at the near end of the song when its revealed that the fruit are really babies and the bear is the distraught mother. Made even worse when its revealed that she MURDERED THE MOTHER TO STEAL HER CHILDREN. Fits into Adult Fear too.
While not as scary as some others, "Blood-Stained Switch is still pretty creepy. It starts off with a girl with an evil alter ego... said 'Alter Ego' kills her father. The song ends with the girl exclaiming that she's not evil, and begging not to be given an injection.
Wendy By Mothy well....we can already tell it won't be happy despite the cheery tune. With a girl trying to follow Peter Pan by jumping out of a window and dying, how could it be?
Flames of Yellow Phosphorous is a delightful retelling of The Little Match Girl where she burns down her father's house and is consequently burned at the stake for her crime.
Mother of Pearl Bones. With an unsettling PV, glitch parts in the vocals, and the unsettling lyrics, what's to come? Well, it's learned that she dies in a fire, a theory states, and her "lover" is dead, too.
This. It's a Megurine Luka song, in English, based on the following Rugrats theory: "The Rugrats really were a figment of Angelica's Imagination. Chucky died a long time ago along with this mother, that's why Chaz is a nervous wreck all the time. Tommy was a stillborn, that's why Stu is constantly in the basement making toys for the son who never had a chance to live. The DeVilles had an abortion, Angelica couldn't figure whether it would be a boy or a girl thus creating the twins."
This song about HIM from The Powerpuff Girls. The PV shows a silhouette that looks like Bubbles and her Octi doll is on the floor in front of her with HIM's sinister shadow radiating from it. HIM tells Bubbles "not to cry" and that he wants her to "smile". He then tells her to "give in to her fight" and "take the anger deep inside and bring it into light". at the end, his message gets more and more garbled and then he promises to Bubbles that he will give her anything she wants. He then tells her that she's "his to control"...and to "prepare to attack".
With a title like Hold, Release; The Rakshasa and the Corpse, what else can you expect? Miku in this video is the still-tormented ghost of a girl from an abusive family. She wants to be 'strong' and forget all the horrible things in her life (her abusive parents, their divorce, being sold into sexual slavery) so the Rakshasa teach her how to crush her memories, and thus her former self.
Engloids are not exempt from this. Big Al's Beat Beat Tick Tick. There's a line implying that Al fell from very high up, and then the realization that the picture wasn't him covered in blood from a murder - It was his OWN. He's laying on the ground DYING, and the beating and ticking is his heart slowly stopping as he does.
Beat. Beat. Tick. Tick.
From the same writer, we have Halloween Requiem. A group of teenagers try to summon dead spirits but it goes horribly wrong and a bunch of evil spirits emerge from their Ouija board. The spirits are extremely offended at the fact that nobody is afraid of them because of Halloween and promptly start attacking people to "strike fear back into their hearts (and it's implied that their first victims were a bunch of trick-or-treaters). Leon is shown running from a demon and in a total panic. Miriam, a nun, believes that it's the apocalypse. Lola and her husband are suddenly attacked in their own home. Big Al, a doctor, tells a wounded Leon that he can't help him because "the hospital is overflowing" and that he should probably stay there because "it's safer there" and "free space is growing" (implying that more people are dying than he and Sweet Anne can treat). Sonika is lying in an ambulance and implied to be dead at the end of her verse. At the climax, something happens that causes the monsters to leave, but their fear remains in the world's heart as it's revealed at the end that due to the incident nobody celebrates Halloween anymore; instead, they celebrate the day that October passes. At the end, the Engloids give us some advice: "If you choose to laugh at evil make sure you think twice".
Tarantula features Oliver eating a live tarantula. And describing the sensation of eating it. In English. Yes.
Even Yuki isn't exempt from horror songs. This artist has apparently done a series of Vocaloid noise songs. Including more by Yuki. absence seems to most resemble a traditional song, but it's still incredibly oppressive and hopeless-sounding. The translation of the lyrics doesn't help. "That child isn't anywhere... that child isn't anywhere... that child isn't anywhere... that child isn't anywhere..."
crushed Mary is... something else, that's for sure. There isn't much in the way of lyrics, so interpertations are sparse, but the "music", if you can call it that, is horrific and cacophonic. This is one you don't want to listen to with headphones in.
By the same person as above, we have Miku's The Path to Eternal Happiness, I found it. It starts out pretty cute with a Bride!Miku who tells a story of newly-wed couple on a beach and the bride asking if the groom knows about 'a paradise to the south, the city of hopes where wishes come true'. She then says that she found a way to go there and disappears to find immortality. Then we see another Miku who acts like a host and is most likely the ruler of the place. Bride!Miku then has to play 'The Original Sin Game', while she plays we see panels with words flashing by, but you have to pause them at the right time to actually be able to read them. Miku wins and we cut back to the beach and we learn see that the Groom always continued to wait for her at the beach, until his death. She apparently wrote him a letter, but it was never read. Then we go to the game show again and see that the host is surprised that Bride!Miku is there again. This time Bride!Miku has to play 'The Game of Guilt', which she wins again and as a reward she becomes a zombie.
Parasite. A hard, thrashing, dark metal song featuring distorted vocals and lyrics that are probably about mosquitoes that carry deadly disease... written from the point of view of the mosquitoes.
Though it isn't truly Vocaloid-based, the artist watashinokoko creates noise songs using the program La La Voice, a technical predecessor to Vocaloid. Many of these songs are incredibly nightmarish. Examples include:
Like You. The song starts out very quiet, but then the noise kicks in. And the content of the song and video itself does nothing to take the edge off; the song starts off normally enough (for a noise song,) a flickering image of a girl in the background, and then words appear on the screen, requests (ranging from "fuck me" to "listen [to] me.") And then it changes to "Kill me." Repeated over and over and over again, as the image of the girl in the background flips upside-down and starts to change, her eyes darkening until they're entirely blacked out.
Complex. A dark, mysterious, and discordant song with surreal imagery presented in black, red, and white.
Jisatsu Shoujo, a Miku song whose title translates to "Suicide Girl". It's intentionally discordant, and you can practically hear how fragile Miku's mental state must be. The PV isn't much better, depicting a skinless Miku whose face appears to be frozen in a scream of agony.
"A 13-Year-Old Killer," by Kagamine Rin. The subject matter is upsetting enough, but the dark, creepy sound of the song and the male narrator that you can barely make out over the music barely helps. And the final spoken line of the song is chilling, once you put it all together...
This. It's a 30 second video of Miku repeatedly stabbing... someone. The amount of blood around and the sound that the stabbing makes both imply that she's been at this for a while, and she doesn't seem to be interested in stopping. Upon watching the making-of, it's revealed that the person that she's stabbing is Kaito. "Love is War" playing softly in the background does not help.
Tympole (Otamaru)'s face in the PokémonIsshu Rap. For added fun, parts of the song were produced by Daijoubu-P and Utsu-P, mentioned above, and they stick to their usual styles.
KAITO ga UNINSTALL: Kaito goes Yandere and kills the other Vocaloids so he can be his master's center of attention and affection.
Fear Garden, in which Rin sings about cutting the other Vocaloids' arms off and planting them like flowers in her garden.
The Purple Forest sung by Miku and Kaito. The creepiest thing about this song is that there is no ominous notes, it sounds sweet and pretty and lovely the whole way. The only way you know it is creepy is if you watch the video, and after that, the simple fact of such a pleasant sounding song with an ominous backstory is chilling. The story is about a forest that no one likes to enter. A traveler (Kaito) wanders in and meets a pretty young girl (Miku). She turns out to be a dryad who lures people to her, and absorbs them into her tree for sustenance. She does this to Kaito while he sleeps, while the whole time Kaito believes he's being taken to a paradise. And then at the very end of the vid, Miku looks right at you with the beginnings of aSlasher Smile.
We Were Friends Until Yesterday by Miku is a deceptively cute song about a girl that becomes friends with a weird sunfish...thing. Takes a turn for the worse when their food runs low and her "friend" starts to look more like food...
Prisoner and Paper Airplane ride on the anxiety caused by being permanently separated from a loved one. Except in this case, one part of the couple (Rin) is a terminally Ill Girl, and the other part of the couple (Len) is in a prison—no, a concentration camp. One with backdrops derived from Auschwitz. We first, in "Prisoner", witness Len being put to death in a gas chamber. Then in "Paper Airplane", we see Rin being put on gradually more life support, until she ultimately passes away.
'Wakako and Ruriko's Breaking of Toy Blocks'. It can be found here. The entire video is a rainy night scene with two people, one of which looks a bit taller. And then at the end you see the knife in the little girl's hand is 'DRIPPING' with blood.
For that matter, ChikuwaP's sequel, ItaiAtashiAshitaAitai is also pretty creepy. Like above, what makes it Nightmare Fuel is that special little bonus you get when you attempt to pause when the screen wipes out (0:23 and 2:52)
And on the subject of Chad's fun little videos, If you decide to watch Incoming/Outgoing , whatever you do, don't:
pause for more than 30 seconds
pause at 0:24
pause between 2:01 and 2:02
Trick and Treat is about Miku being lured into a house in the woods by Rin and Len, and being drugged with candy to make her fall asleep. She wakes up sooner than they anticipated and suddenly remembers where she knows the pair from. They're her old dolls, which she abandoned after getting a new one. Once Rin and Len realize that she's awake, things get worse in a hurry. The twins want Miku's heart... and succeed in getting it.
The Riddle Solver Who Can't Solve Riddles is more than a little disconcerting, as it starts out with Len interrogating his sister, who apparently has murdered all the guests... but by the end of the video it's fairly obvious Len is the one who killed them all and he's about to do the same to her.
"50/50," a Miku song about a girl who is jealous of her best friend Mari-chan's new boyfriend... so she cuts him in half so that they can share. "Mari-chan and I go halfsies on everything."Now available with English subtitles.
Black and White Ward (also known as Monochrome Ward) is the story of science gone horribly wrong. It flies by so fast that you may not realize that Rin has swapped clothes/appearance with Len at the end. It ends with Rin dead, Rin's assertation that Len is still a nobody, and the words Congratulations "Rin".
Love Disease featuring Luka. Starts off as a peppy swing song about going on a date, until we learn that Luka was just daydreaming about the whole thing. Then she catches her love interest going out with another woman, which prompts her to Murder the Hypotenuseso she can have him all to herself, and at the same time that eyes-out-of-frame shot that's remained still the whole time zooms out to reveal a Slasher Smile with Ax-Crazy eyes. She stalks him and tries repeatedly to get in contact with him (and it's implied he's trying to get away from her). "If I Can't Have You" goes into full effect by the end of the song; it's implied she either kills him or rapes him.
Wonder Girl & Labyrinth Gate is the tale of Hansel and Gretel, and how they defeat the evil witch! Except that Hansel is a doll, the candy house is run-down shed, and the wicked witch isn't a witch at all. (Note: turn on CC to view english subs)
From Steampianist and Morbid-Morsel comes Twaddles of a Flue Faker. Sung by Oliver, it gives the POV of a young chimney-sweep from England. Combining a creepy black, white, and red PV with strange, spooky music, the flatness of Oliver's voice and lyrics that are a combination between Tear Jerker and Nightmare Fuel, the overall effect is highly unsettling.
From JUSF Zhou Cun, a Luo Tianyi/Yan He song: Puppet Master: Finest Creation. It sounds jazzy and all, but... the PV begins with a disclaimer of sorts: Yandere, check. Representation of blood, check. Body parts cut to pieces, check. It's about a man trying to create the perfect doll from human parts and constantly being unsatisfied and hacking it up again. Said 'doll' is implied to still be alive.